Easy Stainless Steel Deckfiller - Red Cap - Diesel - This deck filler is made from stainless steel and can be opened easily with either a standard winch handle or filler key. It does not have a thread but a bayonet lock, meaning that it is secure at all times • Fits 38mm pipe • Comes with chain on cap.• For replacement cap see product code: 850322• For replacement seal see product code: 850324